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J E. DIMSEY. Centering Machine;

No. 228,249, Pat'ente'd 111.151, 1880.

N. PETERS, PHDYO-UTHOGRAPHm WASHINGTON. D. c.

UNITED STATES JOHN E. DIMSEY, OF VIENNA STATION, VIRGINIA.

CENTERlNG-MACHINE.

SPECIFICATION formingpart of Letters Patent No. 228,249, dated June 1, 1880.

Application filed February 19, 1880.

To all whom it may concern Be it known that I, JOHN E.D1MsEY,of Vienna Station, in the county of Fairfax and State of Virginia, have invented certain new and useful Improvements in Centering-Machines; and I do hereby declare that the followingis a full, clear, and exact description of the invention, sufficient to enable others skilled in the art to which it appertains to make and use the same, reference being had to the ac companying" drawings, and to the letters of reference marked thereon, and in which- Figure 1 is a vertical longitudinal section of my improved centering-machine, and Fig. 2 is an end elevation thereof.

This invention has reference to improvements in machines for ascertaining the center of cylindrical surfaces in the direction of their longitudinal plane in an expeditious and simple way; and it consists of a hollow cone with adjustable clamps attached to its open or large end and an adjustable holding and adjusting device connected to the same end of the cone, substantially as hereinafter more fully set forth.

In the accompanying drawings, A marks the cone, having a corresponding chamber and a tubular neck, a, whose exterior is provided with a screw-thread and fitted by an inner screw-threaded sleeve or thimble, I), provided with a hand-wheel or fixed nut, B. G is the drill, placed in the tubular neck of the cone with its point toward the open or large end of the cone, while its opposite end is shouldered, as at c, on the inside of the wheel or nut B, thence passed through the latter, and provided with a handle or crank, D, for its operation.

The wheel B, with its screw-threaded sleeve adjusted upon the screw-threaded neck of the cone A by turning it in the required direction, provides for feeding the drill up to its work as it bores into or penetrates the iron or cylinder, after ascertaining the center thereof.

Affixed to the face of the open or large end of the cone A by adjusting thumb-screws d are preferably four right angled slotted clamps, D, placed about equidistant apart, and with their horizontal portions adapted to bear against the circumference of the cylinder and hold it in its centered position, as seen in the two figures. Extending out from the face of the open or large end of the cone are rods 6, upon whose outer screw-threaded and nutted ends f are fitted vertical or upright screwthreaded rods E. The lower screw-threaded ends of the rods E are connected together by a cross-bar, F, with a centering-screw, g, passing up through it, while an arched or V-shaped yoke, G, is fitted upon the upper screwthreaded ends of the screw-rods E.

The rods E are supplied above the crossbar or yoke G with nuts h, and below the cross-bar F with nuts h, for adjusting the said yoke and bar and securing them, against the cylinder.

The inner surface of the yoke G is ribbed or roughened, as at i, to cause it to gripe and prevent longitudinal movement of the cylinder while being bored or under the action of the drill.

The slotted clamps D provide for holding different-sized cylinders.

To ascertain the center in the longitudinal plane of the cylinder, one end of the latter is inserted into the cone so as to rest against its converging inner sides. The clamps are then adjusted with their horizontal surfaces against the cylinder and projecting an equal distance beyond the inner surface of the face of the cone, which brings the exact center of the cylinder in line with the boring implement or drill to permit it to be bored out centrally. The support F is now adjusted up closely against the under side of the cylinder and its center-screw screwed up tightly against the said side of the cylinder, and the yoke is then secured down firmly upon the upper side of the cylinder. The cylinder-securing yoke and cross-bar are now moved with the upright screw-rods E upon the screws of the rods 6 until the inner end of the cylinder comes in contact with the inner surface of the cone, after which the nuts upon the screws of the rods 6 will be tightened, and the cylinder be thus properly centered and secured in position for boring or drilling.

Having thus fully described my invention, I claim and desire to secure by Letters Patent- In a centering-machine, the combination,

with the cone having a drill or boring imple- In testimony whereof I hereto affix my signa- IO ment, of the right-angled slotted clamps, eontnre in presence of two subscribing witnesses. nected or adj Listed by thumb-screws to the face of the large or open end of the cone, the screw- JOHN E. DIMSEY. threaded and nutted rods 6, having the up- I v right screws E and yoke G, and cross-bar F, Witnesses:

having a centerscrew fitted upon the screws J. WM. MISTER,

E, with nuts, substantially as and forthe pur- JAMES M. WRIGHT, Jr.

pose set forth. 

